Complex Boronized Layer on the Hot-dip Aluminized Steels and Its Surface Performances
来源期刊：材料热处理学报2004年第5期
论文作者：LI Dian-kai CHEN Kang-min LUO Xin-min WANG Lan
关键词：hop-dip aluminizing; complex boronizing; oxidization; hot-corrosion; abrasion; wear;
摘 要：Plain carbon steels were dipped in molten aluminum bath at 720℃±5℃ and diffused for 1, 2.5 and 6 hours respectively and then boronized at 950℃ for 6 hours. The oxidation, hot-corrosion and abrasion resistance behavior were examined. The experimental results showed the compounds of the aluminized layer, from the surface to the matrix, were composed of Fe2Al5 ( η -phase )、 Fe3Al ( β 1-phase ) and α phase. The microstructure of aluminized plus complex boronized were similar to that simplex boronized. The XRD analysis results indicated that there existed Fe2B、 Fe2AlB2 and Fe2Al5 in this kind of layer. The simplex aluminized layers still remained bright gray appearance when oxidized at 950℃, but complex boronized layer was not able to resist oxidization at the temperature. Both the layers of complex boronized and aluminized had the same anti-oxidization level in the circulative oxidization tests, and also good anti-corrosion ability in molten salt medium. Under dry abrasive conditions, wear resistance of complex boronized layer was superior to the aluminized layer.
LI Dian-kai1，CHEN Kang-min1，LUO Xin-min1，WANG Lan1
(1.Jiangsu University, Zhenjiang, Jiangsu, P.R. China)
摘要:Plain carbon steels were dipped in molten aluminum bath at 720℃±5℃ and diffused for 1, 2.5 and 6 hours respectively and then boronized at 950℃ for 6 hours. The oxidation, hot-corrosion and abrasion resistance behavior were examined. The experimental results showed the compounds of the aluminized layer, from the surface to the matrix, were composed of Fe2Al5 ( η -phase )、 Fe3Al ( β 1-phase ) and α phase. The microstructure of aluminized plus complex boronized were similar to that simplex boronized. The XRD analysis results indicated that there existed Fe2B、 Fe2AlB2 and Fe2Al5 in this kind of layer. The simplex aluminized layers still remained bright gray appearance when oxidized at 950℃, but complex boronized layer was not able to resist oxidization at the temperature. Both the layers of complex boronized and aluminized had the same anti-oxidization level in the circulative oxidization tests, and also good anti-corrosion ability in molten salt medium. Under dry abrasive conditions, wear resistance of complex boronized layer was superior to the aluminized layer.
关键词:hop-dip aluminizing; complex boronizing; oxidization; hot-corrosion; abrasion; wear;
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